dm: remove unnecessary unlikely() around WARN_ON_ONCE()

WARN_ON() already contains an unlikely(), so it's not necessary to
wrap it into another.
Signed-off-by: Igor Stoppa <igor.stoppa@huawei.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm-cache-policy-smq.c

@@ -1200,7 +1200,7 @@ static void queue_demotion(struct smq_policy *mq)
 	struct policy_work work;
 	struct entry *e;
 
-	if (unlikely(WARN_ON_ONCE(!mq->migrations_allowed)))
+	if (WARN_ON_ONCE(!mq->migrations_allowed))
 		return;
 
 	e = q_peek(&mq->clean, mq->clean.nr_levels / 2, true);

drivers/md/dm.c

@@ -1666,7 +1666,7 @@ static blk_qc_t __process_bio(struct mapped_device *md,
 		 * Defend against IO still getting in during teardown
 		 * - as was seen for a time with nvme-fcloop
 		 */
-		if (unlikely(WARN_ON_ONCE(!ti || !dm_target_is_valid(ti)))) {
+		if (WARN_ON_ONCE(!ti || !dm_target_is_valid(ti))) {
 			error = -EIO;
 			goto out;
 		}